49ers add tight end Derek Carrier to roster

NEW ORLEANS -- The 49ers promoted tight end Derek Carrier from the practice squad Saturday to add depth for Sunday's game against the host Saints.

Garrett Celek, who's been the No. 3 tight end since last season, is doubtful to play Sunday because of a hamstring strain that's kept him out of practice all week.

Carrier entered the NFL last year with the Raiders as an undrafted free agent before spending last season on the Philadelphia Eagles practice squad. The 49ers acquired the Beloit College product two months ago and have converted him from a wideout into a tight end.